Burglar-alarm.



T. KOSCHADE.

BURGLAH ALARM.

APPLlcATIoN man FEB. 12. 1914.

1,219,957.v Patented Mar. 20, 1917.

F L' E .l.

' j 1.9 /7 Z 5 7 MM i IUIIITEI) STATES PATENT OFFICE.

THEOPHIL KOSCHADE, OF NORTH ADELAIDE, SOUTH AUSTRALIA, AUSTRALIA.

BURGLAR-ALAR1VL Application filed February 12, 1914.

T0 all whom t may concern.'

Be it known that I, THEOPHIL KoscrrADE, a subject of the King of Great Britain, residing at North Adelaide, in the State of South Australia, Australia, have invented certain new and useful Improvements in Burglar-Alarms, of which the following is a specification.

In devices of this character, heretofore known, reliance has been placed solely upon operation of the device upon tampering or opening movement of the door or window and such devices have not heretofore ineluded means for initially locking a door or window so that entrance could not be effected except by positively unlocking the door or window before moving the same into an opening position, and therefore it is the object of my invention to overcome this defect in prior devices by necessitating the positive operation of the locking means to iirst unfasten the door or window before entrance can be attempted, such unfastening or unlocking movement serving, in accordance with my invention, to actuate the alarm.

Other features of novelty will be more' fully described in connection with the accompanying drawing and will be more particularly pointed out and ascertained in and by the appended claims.

In the drawing:

Figure 1y is a face view showing the application of the device of my invention mounted to secure a window.

Fig. 2 is a horizontal longitudinal sectional view through the structure disclosed in Fig. 1.

Fig. 3 is a detail view of a form of insulation used in the device of my invention.

As illustrated, 1 designates a portion of a window sash and 2 designates a portion of a window frame. 4 are shown secured to the frame and sash, respectively, on which the device of my invention may be mounted.

I have shown a positive locking means in the form of a bolt lock wherein a keeper 5 is secured to the sash 3 by means such as screws 6 and wherein the bolt sheath 7 is secured to the frame, or rather the mounting 4l, by means such as screws 8. In the present construction I secure the keeper 5 to the block 3, and the latter may be secured to the sash 1 by means such as screws 9. A

Specification of Letters Patent.

Mounting blocks 3 and,

Patented Mar. 2o, 1917.

Serial No. 818,339.

bolt 10 is provided with an operating shank l1 provided with a knob 12 thereon. The sheath 7 is provided with an unlocking slot 13 running longitudinally thereof, and locking slots 14 extending transversely of the slot 13. It will be readily seen from the foregoing description, that when the bolt 10 is shot into the keeper and the shank 11 is in the position shown in Fig. 1, it will be impossible to raise or lower the window without first retracting the bolt 10. The keeper is to be located on the window in any desired location or I may have more than one keeper on the window sash.

I preferably insulate the keeper 5 and the sheath 7, byl mounting the same on blocks of liber 15 and 1G, respectively, as will be seen more clearly by reference to Fig. 2.

A circuit-closing member preferably in the form of a keeper 17, is also mounted upon the insulating base 16 and is tubular in form so that when the bolt 10 is retracted it will be projected into the circuit-closing memberI 17. The member 17 may be mounted by means such as screws 18. I also desire to insulate the member 17 from the sheath 7, and I provide a ring of insulating material, as indicated at 19, in Fig. 8, and which is provided with extensions 20 projecting between the flanges of the sheath 7 and the circuit-closing member 17 I have shown the sheath 7 and the circuitclosing member 17 bridged in a circuit including conductors 21 and 22. Conductor 21 is connected as at 23 with the flange of sheath 7, and the conductor 22 is connected as at 24, with the flange of circuit-closing member 17. A source of current 25 and a switch 26 are also included in the circuit. An alarm device, preferably of the audible type in the form of a bell 27, is also included in the circuit.

It will now be clear that when the bolt 10 is retracted from the locking position shown to an unlocking position, or toward an unlocking position, circuit will be almost instantly closed between the circuit-closing member 17 and the bolt 1'0, back through the sheath 7 to conductor 21. Thus an alarm will be given to arouse the household. Of course a window would be locked in position at such a restricted elevation, or to provide such a restricted opening, as to prevent a burglar or other persons from surreptitiously entering through the window,

thereby necessitating unlocking of the Window before it could be sufficiently raised to permit of entrance.

ln cases where glass doors are used and Where it has been found that bolts have been unlocked by cutting the glass, the device of my invention is very advantageous.

it is believed that the operation and utility of the device of my invention will be clearly understood from the foregoing description, and While I have herein shown and described one specific form thereof, l do not wish to be limited thereto except for suoli limitations as the claims may import.

l. A burglar alarm device for doors or Windows to be used in connection with an electric circuit comprising a positive locking means including a keeper on the sash and a bolt sheath on the frame, a bolt in said sheath adapted to be shot into said keeper, a tubular circuit-closing member connected with one conductor of the circuit and disposed in alinement with said sheath to receive the bolt when the same is moved toward an unlocking position, and means for connecting another conductor of the circuit with said sheath for closing circuit through said bolt when the same is moved toward an unlocking position.

2. A burglar alarm device for doors or Windows to be used in connection With an electric circuit comprising a bolt sheath to be connected with one of the members to be held and connected in one of the Wires of the circuit, a bolt keeper mounted on the second member to be fastened in alineinent with said bolt sheath, a bolt mounted in said sheath to be capable of movement into and out of said keeper, and an element mounted in alined proximity to said sheath and in* sulated therefrom and connected with tl e remaining Wire of the circuit, the parts being arranged in a relation that as the bolt is moved into the locked relation with the keeper contact With said element is precluded and as the bolt is moved to the released position the element is engaged and the circuit is completed.

In testimony whereof l.' afiiX my signature in presence of two Witnesses.

THEOPHIL KSCHADE.

`Witnesses S. BEOKETT, P. L. CONIGRAW.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

